Which one of the following numbers is not a palindromic number?
Show answer & explanation
Correct answer: C
Explanation
A palindromic number is a number that remains the same when its digits are reversed (it reads the same forward and backward).
Evaluating the Options:
Identify which number is not palindromic:
1) 1991: Reversed, it is still 1991. (It is a palindrome)
2) 13431: Reversed, it is still 13431. (It is a palindrome)
3) 3983: Reversed, it becomes 3893. Since, 3983 ≠ 3893, this is not a palindrome.
4) 12321: Reversed, it is still 12321. (It is a palindrome)
Hence, the correct answer is option (3).